Rabbi ben Ezra , or Abraham ben Meir ibn Ezra, born 1092 in Emirate of Saragossa (Spain) - died 1167 in Calahorra, Spain, was one of the great poets, mathematicians and scholars of the 12th Century. He wrote on grammar, astronomy, the astrolabe, etc.

He is immortalized in Robert Browning's poem, 'Rabbi ben Ezra.' which begins:

Grow old along with me!
The best is yet to be...

though the poem does not express any of Abraham ibn Ezra's historical reality.

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